updating tests for Reverse-String exercise

exercises/practice/reverse-string/.meta/config.json

@@ -2,6 +2,9 @@
   "authors": [
     "keiravillekode"
   ],
+  "contributors": [
+    "jagdish-15"
+  ],
   "files": {
     "solution": [
       "reverse_string.c",

exercises/practice/reverse-string/.meta/tests.toml

@@ -1,6 +1,13 @@
-# This is an auto-generated file. Regular comments will be removed when this
-# file is regenerated. Regenerating will not touch any manually added keys,
-# so comments can be added in a "comment" key.
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
 
 [c3b7d806-dced-49ee-8543-933fd1719b1c]
 description = "an empty string"
@@ -19,3 +26,12 @@ description = "a palindrome"
 
 [b9e7dec1-c6df-40bd-9fa3-cd7ded010c4c]
 description = "an even-sized word"
+
+[1bed0f8a-13b0-4bd3-9d59-3d0593326fa2]
+description = "wide characters"
+
+[93d7e1b8-f60f-4f3c-9559-4056e10d2ead]
+description = "grapheme cluster with pre-combined form"
+
+[1028b2c1-6763-4459-8540-2da47ca512d9]
+description = "grapheme clusters"

exercises/practice/reverse-string/test_reverse_string.c

@@ -50,6 +50,21 @@ static void test_an_even_sized_word(void)
    test_reverse("drawer", "reward");
 }
 
+static void test_wide_characters(void)
+{
+   test_reverse("子猫", "猫子");
+}
+
+static void test_grapheme_cluster_with_pre_combined_form(void)
+{
+   test_reverse("Würstchenstand", "dnatsnehctsrüW");
+}
+
+static void test_grapheme_clusters(void)
+{
+   test_reverse("ผู้เขียนโปรแกรม", "มรกแรปโนยขีเผู้");
+}
+
 int main(void)
 {
    UNITY_BEGIN();